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Your dap has high output impedance, high output impedance is the culprit for hiss on BA iems
I have toneking ting, to200 and bl1 planar. I love ting and to200 but bl1 is too warm for my taste
AR M200 on drop.com(formerly massdrop), currently not available though, you can request
I see that you use litz for loudspeaker, how bout portable audio ( earbud, iem, headphone, portable battery powered DAP ), are portable audio...
From your list, I have ta t2, soundsig wise it's neutral reference with a touch of bright I consider t2 is the bastion of under $50, because...
Zishan DSD, SQ wise though, this thing is pure music player, no BT no wifi no Android OS, ready to use in 1 second, simple UI, 10-11 H battery...
Interesting hybrid iem. I wonder what kind of DAP you use?.is F3 hard to drive?. Is F3 benefit amplification?
For cable replacement you can search " wmc-nw20mu" on AliExpress app
Just wait for 11.11 AliExpress sales event, t4 will be around $110-115
How about toneking t4 @thejoker13
Try search on Ali, hisenior b5+, 10 Knowles ba for $99, scroll down for item description, knowles 30265, 31116 and 29689